High-strength high-toughness ultrafine-grained high-entropy alloy and preparation method thereof

Abstract

The invention belongs to the technical field of alloy material, and discloses a high-strength high-toughness ultrafine-grained high-entropy alloy and a preparation method thereof. The high-strength high-toughness ultrafine-grained high-entropy alloy is composed of the following elements according to the atomic percentage: 20%-25% of Ni, 18%-20% of Fe, 18%-22% of Co, 18%-20% of Cr, and 20%-24% of Al; the microstructure takes a body-centered cubic disordered solid solution phase rich in Ni and Al elements as a matrix phase, and takes a face-centered cubic disordered solid solution phase rich in Fe and Cr elements as a reinforcing phase. The preparation method of the alloy comprises the steps: elemental powders with the atomic percentages are subjected to powder mixing and high-energy ball milling to prepare an amorphous composite powder, and the amorphous composite powder is sintered to obtain the high-strength high-toughness ultrafine-grained high-entropy alloy. The prepared high-entropy alloy has the advantages of large size and good comprehensive mechanical properties, and can be used in the fields of aeronautics and astronautics, military industry, electrons, instruments and apparatuses and the like.

Description

technical field

[0001] The invention belongs to the technical field of ultrafine-grained alloy materials, and in particular relates to a high-strength ultrafine-grained high-entropy alloy and a preparation method thereof. Background technique

[0002] High-entropy alloys have high strength, high hardness, good wear resistance and oxidation resistance. As a new type of structural and functional materials, high-entropy alloys have broad application prospects in aerospace, military, electronics, instrumentation and other fields. However, most of the high-entropy alloys with high strength and high plasticity prepared at this stage are small in size, which limits their application in structural materials. The development of high-entropy alloys with large size, high strength and high plasticity has become the goal that researchers have been pursuing.

[0003] At present, most of the developed high-entropy alloy systems are prepared by copper mold suction casting method, arc melti...

Examples

Embodiment 1

[0034] A high-strength and tough ultrafine-grained high-entropy alloy in this embodiment is prepared from the following atomic percentage components: 20% Ni, 20% Fe, 20% Co, 20% Cr, and 20% Al.

[0035] The preparation method of the above-mentioned high-strength and tough ultra-fine-grained high-entropy alloy, the specific operation steps are as follows:

[0036] (1) mixed powder

[0037] The elemental powders with atomic percentages of Ni 20%, Fe 20%, Co 20%, Cr 20%, and Al 20% were dry-blended in a V-0.002 type powder mixer for 24 hours until uniform, and the average particle size of each elemental powder Both are about 50 μm, the purity of aluminum is 99.0wt.%, and the purity of other elemental powders is higher than 99.9wt.%.

[0038] (2) Preparation of amorphous composite powder by high energy ball milling

[0039] The high-energy ball mill is completed by QM-2SP20 planetary ball mill. The material of the ball and the inner wall of the ball mill is made of stainless ste...

Embodiment 2

[0050] A high-strength and tough ultrafine-grained high-entropy alloy in this embodiment is prepared from the following atomic percentage components: 25% Ni, 18% Fe, 18% Co, 18% Cr, and 21% Al.

[0051] The preparation method of the above-mentioned high-strength and tough ultra-fine-grained high-entropy alloy, the specific operation steps are as follows:

[0052] (1) mixed powder

[0053] The elemental powders with atomic percentages of Ni 25%, Fe 18%, Co18%, Cr 18%, and Al 21% were dry-blended in a V-0.002 type powder mixer for 24 hours until uniform, and the average particle size of each elemental powder was uniform. About 50 μm, the purity of aluminum is 99.0wt.%, and the purity of other elemental powders is higher than 99.9wt.%.

[0054] (2) Preparation of amorphous composite powder by high energy ball milling

[0055] The high-energy ball mill is completed by QM-2SP20 planetary ball mill. The material of the ball and the inner wall of the ball mill is made of stainless ...

Embodiment 3

[0066] A high-strength and tough ultrafine-grained high-entropy alloy in this embodiment is prepared from the following atomic percentage components: 20% Ni, 20% Fe, 18% Co, 18% Cr, and 24% Al.

[0067] The preparation method of the above-mentioned high-strength and tough ultra-fine-grained high-entropy alloy, the specific operation steps are as follows:

[0068] (1) mixed powder

[0069] The elemental powders with atomic percentages of Ni 20%, Fe 20%, Co18%, Cr 18%, and Al 24% were dry-blended in a V-0.002 type powder mixer for 24 hours until uniform, and the average particle size of each elemental powder was uniform. About 50 μm, the purity of aluminum is 99.0wt.%, and the purity of other elemental powders is higher than 99.9wt.%.

[0070] (2) Preparation of amorphous composite powder by high energy ball milling

[0071] The high-energy ball mill is completed by QM-2SP20 planetary ball mill. The material of the ball and the inner wall of the ball mill is made of stainless ...

technical field

[0001] The invention belongs to the technical field of ultrafine-grained alloy materials, and in particular relates to a high-strength ultrafine-grained high-entropy alloy and a preparation method thereof. Background technique

[0002] High-entropy alloys have high strength, high hardness, good wear resistance and oxidation resistance. As a new type of structural and functional materials, high-entropy alloys have broad application prospects in aerospace, military, electronics, instrumentation and other fields. However, most of the high-entropy alloys with high strength and high plasticity prepared at this stage are small in size, which limits their application in structural materials. The development of high-entropy alloys with large size, high strength and high plasticity has become the goal that researchers have been pursuing.

[0003] At present, most of the developed high-entropy alloy systems are prepared by copper mold suction casting method, arc melti...

Examples

Embodiment 1

[0034] A high-strength and tough ultrafine-grained high-entropy alloy in this embodiment is prepared from the following atomic percentage components: 20% Ni, 20% Fe, 20% Co, 20% Cr, and 20% Al.

[0035] The preparation method of the above-mentioned high-strength and tough ultra-fine-grained high-entropy alloy, the specific operation steps are as follows:

[0036] (1) mixed powder

[0037] The elemental powders with atomic percentages of Ni 20%, Fe 20%, Co 20%, Cr 20%, and Al 20% were dry-blended in a V-0.002 type powder mixer for 24 hours until uniform, and the average particle size of each elemental powder Both are about 50 μm, the purity of aluminum is 99.0wt.%, and the purity of other elemental powders is higher than 99.9wt.%.

[0038] (2) Preparation of amorphous composite powder by high energy ball milling

[0039] The high-energy ball mill is completed by QM-2SP20 planetary ball mill. The material of the ball and the inner wall of the ball mill is made of stainless ste...

Embodiment 2

[0050] A high-strength and tough ultrafine-grained high-entropy alloy in this embodiment is prepared from the following atomic percentage components: 25% Ni, 18% Fe, 18% Co, 18% Cr, and 21% Al.

[0051] The preparation method of the above-mentioned high-strength and tough ultra-fine-grained high-entropy alloy, the specific operation steps are as follows:

[0052] (1) mixed powder

[0053] The elemental powders with atomic percentages of Ni 25%, Fe 18%, Co18%, Cr 18%, and Al 21% were dry-blended in a V-0.002 type powder mixer for 24 hours until uniform, and the average particle size of each elemental powder was uniform. About 50 μm, the purity of aluminum is 99.0wt.%, and the purity of other elemental powders is higher than 99.9wt.%.

[0054] (2) Preparation of amorphous composite powder by high energy ball milling

[0055] The high-energy ball mill is completed by QM-2SP20 planetary ball mill. The material of the ball and the inner wall of the ball mill is made of stainless ...

Embodiment 3

[0066] A high-strength and tough ultrafine-grained high-entropy alloy in this embodiment is prepared from the following atomic percentage components: 20% Ni, 20% Fe, 18% Co, 18% Cr, and 24% Al.

[0067] The preparation method of the above-mentioned high-strength and tough ultra-fine-grained high-entropy alloy, the specific operation steps are as follows:

[0068] (1) mixed powder

[0069] The elemental powders with atomic percentages of Ni 20%, Fe 20%, Co18%, Cr 18%, and Al 24% were dry-blended in a V-0.002 type powder mixer for 24 hours until uniform, and the average particle size of each elemental powder was uniform. About 50 μm, the purity of aluminum is 99.0wt.%, and the purity of other elemental powders is higher than 99.9wt.%.

[0070] (2) Preparation of amorphous composite powder by high energy ball milling

[0071] The high-energy ball mill is completed by QM-2SP20 planetary ball mill. The material of the ball and the inner wall of the ball mill is made of stainless ...

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